im not real familiar with nakamura but based on what I saw in the pics Id say it was a $250 bike brand new, 20 years ago. I hope you got it cheap like $70 max. Its a capable bike good for shorter commutes, cruising the park, or even some light off roading. the crank is not the original but the rest looks as if it is. nice starter bike. if you get into biking heavily you will undoubtably want to upgrade but for now it should fix the jones. congrats, ride the wheels off it.
2010 Kestrel RT900SL, 800k carbon, chorus/record, speedplay, zonda
1997 Trek ZX6000, 6061w/manitou spyder, xt/xtr, time atac